Detech EDS plus II, Instruction Manual

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AUTO MODE OF OPERATION
4
IMPORTANT NOTE: When operating on very heavy and wet grounds,
especially if using the bigger sized coils (12x12 inches) while passing the
coil over an open hole in the ground, even if there is no metal in it, is
possible to hear false signal, as if in the hole there was a metal target. In
such case switch the
M/A ground to the M ground position and press the
GND adjust control to “sink” into the panel (the led indicator will light in
green).In most cases this will eliminate this negative affect and will result
in more stable operation of the detector, of course, slightly decreasing its
depth parameters. If the affect of the hole does not disappear, you should
assemble the smaller sized coil.